package cn.zch.soft.util.qrcode.utils;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
public class DesUtil {
  private static Cipher encryptCipher = null;
  private static Cipher decryptCipher = null;
  public static String byteArr2HexStr(byte[] arrB) throws Exception {
    int iLen = arrB.length;
    StringBuffer sb = new StringBuffer(iLen * 2);
    for (int i = 0; i < iLen; i++) {
      int intTmp = arrB[i];
      while (intTmp < 0) {
        intTmp = intTmp + 256;
      }
      if (intTmp < 16) {
        sb.append("0");
      }
      sb.append(Integer.toString(intTmp, 16));
    }
    return sb.toString();
  }
  public static byte[] hexStr2ByteArr(String strIn) throws Exception {
    byte[] arrB = strIn.getBytes();
    int iLen = arrB.length;
    byte[] arrOut = new byte[iLen / 2];
    for (int i = 0; i < iLen; i = i + 2) {
      String strTmp = new String(arrB, i, 2);
      arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
    }
    return arrOut;
  }
  public static void desInit(String strKey) throws Exception {
    Security.addProvider(new com.sun.crypto.provider.SunJCE());
    Key key = getKey(strKey.getBytes());
    encryptCipher = Cipher.getInstance("DES");
    encryptCipher.init(Cipher.ENCRYPT_MODE, key);
    decryptCipher = Cipher.getInstance("DES");
    decryptCipher.init(Cipher.DECRYPT_MODE, key);
  }
  public static byte[] encrypt(byte[] arrB) throws Exception {
    return encryptCipher.doFinal(arrB);
  }
  public static String encrypt(String strIn) throws Exception {
    return byteArr2HexStr(encrypt(strIn.getBytes()));
  }
  private static byte[] decrypt(byte[] arrB) throws Exception {
    return decryptCipher.doFinal(arrB);
  }
  public static String decrypt(String strIn) {
    try {
      return new String(decrypt(hexStr2ByteArr(strIn)), StandardCharsets.UTF_8);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
    return "";
  }
  private static Key getKey(byte[] arrBTmp) throws Exception {
    byte[] arrB = new byte[8];
    for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
      arrB[i] = arrBTmp[i];
    }
    Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
    return key;
  }
}
